package com.ys.gulimall.interceptor;

import com.ys.common.constant.AuthServerConstant;
import com.ys.common.constant.CartConstant;
import com.ys.common.vo.MemberResponseVo;
import com.ys.gulimall.vo.UserInfoTo;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.util.UUID;

/**
 * @Description: 在执行目标方法之前，判断用户的登录状态。并封装传递给controller目标请求
 * @author： yeswater
 * @create： 2024/5/17
 */

public class CartInterceptor implements HandlerInterceptor {
	
	public static ThreadLocal<UserInfoTo> threadLocal = new ThreadLocal<>();
	
	/**
	 * 在目标方法执行之前拦截
	 */
	@Override
	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
		
		UserInfoTo userInfoTo = new UserInfoTo();
		HttpSession session = request.getSession();
		MemberResponseVo member = (MemberResponseVo) session.getAttribute(AuthServerConstant.LOGIN_USER);
		if (member != null) {
			userInfoTo.setUserId(member.getId());
		}
		
		Cookie[] cookies = request.getCookies();
		if (cookies != null && cookies.length != 0) {
			for (Cookie cookie : cookies) {
				String name = cookie.getName();
				if (CartConstant.TEMP_USER_COOKIE_NAME.equals(name)) {
					userInfoTo.setUserKey(cookie.getValue());
					userInfoTo.setTempUser(true);
				}
			}
		}
		
		// 如果没有临时用户，则保存一个临时用户
		if (StringUtils.isEmpty(userInfoTo.getUserKey())) {
			String uuid = UUID.randomUUID().toString();
			userInfoTo.setUserKey(uuid);
		}
		
		threadLocal.set(userInfoTo);
		
		return true;
	}
	
	/**
	 * 业务执行之后，分配临时用户，让浏览器保存
	 */
	@Override
	public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
		UserInfoTo userInfoTo = threadLocal.get();
		// 如果没有临时用户，第一次访问购物车就添加临时用户 cookie
		if (!userInfoTo.isTempUser()) {
			Cookie cookie = new Cookie(CartConstant.TEMP_USER_COOKIE_NAME, userInfoTo.getUserKey());
			cookie.setDomain("gulimall.com");
			cookie.setMaxAge(CartConstant.TEMP_USER_COOKIE_TIMEOUT);
			response.addCookie(cookie);
		}
	}
}
